OCP 1Z0 053 200

200.Which operation requires that you create an auxiliary instance manually before executing the 
operation? (Choose all that apply.) 
A. Backup-based database duplication. 
B. Active database duplication. 
C. Tablespace point-in-time recovery. 
D. No operation requires the creation of an auxiliary instance. 
Answer: AB 

使用duplication时，需要先启动auxiliary instance。

这个auxiliary instance只需要能启动到no mount下就可以了，所以不需要控制文件和数据文件，只有一个pfile就可以。


http://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmdupdb.htm#BRADV167

To create an initialization parameter file and start the auxiliary instance:

1. Using a text editor, create an empty file for use as a text-based initialization parameter file.

2. Copy the initialization parameter file to the operating system-specific default location on the host where SQL*Plus runs.

3. In the parameter file, set DB_NAME to an arbitrary value.

   DB_NAME is the only required initialization parameter. The following example shows a sample DB_NAME setting:

   DB_NAME=somevalue

4. If necessary, set other initialization parameters like those needed for Oracle RAC, and for connecting by using a user ID that has SYSDBA privileges through Oracle Net.

5. Start SQL*Plus and connect to the auxiliary instance with SYSDBA privileges. Start the auxiliary instance in NOMOUNT mode (no PFILE parameter on theSTARTUP command is necessary if the file is in the default location):

   SQL> STARTUP NOMOUNT